There is the whole list to change, they could completely revamp the list if they wanted to. The thing is, they don't want to, and because of that the new fossils list will almost without a doubt be either identical, or extremely similar to the old list.
Also, the lists for ID events generally come out on the SOINC site before the rules are sent out to teams. I would hope and expect that lists for both Fossils and Ornithology would come out this month.
Events: Herpetology, Fossils, Entomology, Rocks & Minerals, Ornithology, Ecology
Nationals 2008: 1st in Herpetology
Nationals 2009: 1st in Herpetology, 2nd in Fossils
Harriton Class of 2010